| Variants of essential arity for partial functionsLehtonen, Erkko; Lekkoksung, Nareupanat
 Kyungpook Mathematical Journal, 60 (2020), 423–443 http://doi.org/10.5666/KMJ.2020.60.3.423
 
 Generalizations of essential arity of partial functions, based on essential sets of arguments, are introduced, and their interplay with the minor relation of functions is investigated.
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